On Tue, Aug 03, 2021 at 09:18:09PM +0200, Andreas Gruenbacher wrote:
> Turn fault_in_pages_{readable,writeable} into versions that return the number
> of bytes faulted in instead of returning a non-zero value when any of the
> requested pages couldn't be faulted in. This supports the existing users that
> require all pages to be faulted in, but also new users that are happy if any
> pages can be faulted in.
>
> Neither of these functions is entirely trivial and it doesn't seem useful to
> inline them, so move them to mm/gup.c.
>
> Rename the functions to fault_in_{readable,writeable} to make sure that code
> that uses them can be fixed instead of breaking silently.
Sigh... We'd already discussed that; it's bloody pointless. Making short
fault-in return success - absolutely. Reporting exact number of bytes is
not going to be of any use to callers.
Please, don't.
